php str_replace returns empty string

Question

<?php

$html = '<form id="form1" name="f1" action="/jk" dummy';

$html = str_replace(
    '<form id="form1" name="f1"',
    '<form id="form1" name="f1" xxxxxxxxxxxxx',
    $html);

echo $html;

Why the result is empty?

I'm using PHP 5.3.27 (cli)

Thanks.

Runs fine. Are you sure you don't have any special characters (such as new lines) within the HTML? Also, if this comes from a webpage, you should consider DOM or methods of parsing. — Dave Chen
– Dave Chen, Commented Mar 12, 2014 at 3:59
Works fine here. Are you viewing this in a browser? Try 'view source', in case the browser is hiding the tag from view. — Marc B
– Marc B, Commented Mar 12, 2014 at 3:59
@MarcB I swear that's probably what the OP is experiencing, good call. — Dave Chen
– Dave Chen, Commented Mar 12, 2014 at 4:00
Thanks guys, that's exactly the problem, I'm testing with Chrome browser. — aj3423
– aj3423, Commented Mar 12, 2014 at 4:07

kraysak · Accepted Answer · 2014-03-12 04:11:29Z

4

$html = '<form id="form1" name="f1" action="/jk" dummy';
$html = str_replace(
    '<form id="form1" name="f1"',
    '<form id="form1" name="f1" xxxxxxxxxxxxx',
    $html);

echo highlight_string($html, true);

another way to show is:

header("Content-Type: text/plain");
echo $html;

answered Mar 12, 2014 at 4:11

kraysak

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Comments

Abhishek · Accepted Answer · 2014-03-12 04:10:03Z

0

Try this method,

<?php
echo 'hello<br>';
$html = "abcde<br>";
echo $html;
$a = substr_replace($html,
    'xyzhi',
    0);

echo $a;
?>

Str_replace will need word which you want to replace from the string.I hope this may work.

answered Mar 12, 2014 at 4:10

Abhishek

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TAHER El Mehdi · Accepted Answer · 2021-05-09 22:45:57Z

0

You can look at source code ctr+u you will find it is replaced successfully there, but Why cannot see it on the browser page? because the browser thinks of it as a tag. So to show it on the browser page we can use htmlentities():

$html = '<form id="form1" name="f1" action="/jk" dummy';
$html = str_replace(
    '<form id="form1" name="f1"',
    '<form id="form1" name="f1" xxxxxxxxxxxxx',
    $html);

echo htmlentities($html);

Output:

<form id="form1" name="f1" xxxxxxxxxxxxx action="/jk" dummy

answered May 9, 2021 at 22:45

TAHER El Mehdi

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